New York Penal - Article 240 - § 240.10 Unlawful Assembly

Penal
§ 240.10 Unlawful assembly.
A person is guilty of unlawful assembly when he assembles with four or
more other persons for the purpose of engaging or preparing to engage
with them in tumultuous and violent conduct likely to cause public
alarm, or when, being present at an assembly which either has or
develops such purpose, he remains there with intent to advance that
purpose.
Unlawful assembly is a class B misdemeanor.